{"id":20218,"date":"2019-08-06T22:07:12","date_gmt":"2019-08-06T20:07:12","guid":{"rendered":"http:\/\/karmaka.de\/?p=20218"},"modified":"2019-08-06T22:07:13","modified_gmt":"2019-08-06T20:07:13","slug":"theoretical-analysis-of-mg-and-si-chemical-and-isotopic-fractionation-at-vaporization-of-ca-al-inclusions-of-chondrites","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=20218","title":{"rendered":"Theoretical Analysis of Mg and Si Chemical and Isotopic Fractionation at Vaporization of Ca\u2013Al Inclusions of Chondrites"},"content":{"rendered":"\n<p>O. I. Yakovlev, S. I. Shornikov<\/p>\n\n\n\n<p>Geochemistry International<br>\nAugust 2019, Volume 57, Issue 8, pp 851-864<\/p>\n\n\n\n<p><a href=\"https:\/\/link.springer.com\/article\/10.1134%2FS0016702919080123\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Experimental study of changes in the composition of Ca\u2013Al inclusions of chondrites during evaporation indicates the chemical and isotopic fractionation of this material are closely interrelated. The coupling is theoretically described using an equations for the evaporation rate of a component of melt (the Hertz\u2013Knudsen equation) and Rayleigh isotope fractionation. The form of the Rayleigh equation (which was derived from the Hertz\u2013Knudsen equation) conventionally used in the foreign literature faces difficulties in interpreting experimental data. The discrepancy between the experimental and model data is explained by the fact that the \u201cideal\u201d isotope fractionation factor used in the Rayleigh equation does not take into account its dependence on the temperature and composition of the evaporating melt. The paper presents an alternative expression for the Rayleigh equation and a new expression of the Hertz\u2013Knudsen evaporation rate with regard for the activity of melt components. The activity of the components is determined by the acidity\u2013basicity index of the melt Ca\u2013Al inclusion, which, in turn, affects the evaporative fractionation of Mg and Si isotopes.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>O. I. Yakovlev, S. I. Shornikov Geochemistry International August 2019, Volume 57, Issue 8, pp 851-864 LINK &#8220;Experimental study of changes in the composition of Ca\u2013Al inclusions of chondrites during evaporation indicates the chemical and&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66,57],"tags":[1846,1946,4810],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20218"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=20218"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20218\/revisions"}],"predecessor-version":[{"id":20219,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20218\/revisions\/20219"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20218"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20218"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}